CyberDean, the 40 cal. is an excellent cartridge, and a good stopper. I carried 2 of the Glock 23s in forty caliber. I felt very well armed, and they carried well, and pointed well.
The only shooting situation I ever was in was on two occasions with two large dogs. 1 a Chow, and the other a Pit. I was happy to shoot both, and both reactied desirablely.
There is an officer I trained about 14 years ago, that also carried the Glock 23, and won a fight decisively at room distance, with an opponent whom was also armed with a handgun. The opponent never got off a shot, and expired on the scene.
As I said good, point-a-bility, and in this case good shot placement. The officer whom is still a good friend said time lapse was less than 3 seconds, and witnesses testified at grand jury of the same. TRAIN TRAIN TRAIN.